Hello Would you please let me know why I have this error when I try to link my object files: $Âgcc -c stack.cpp -o stack.o $Âgcc -c main.c -o main.o $ gcc main.o stack.o -o hello main.o: In function `main': main.c:(.text+0x7): undefined reference to `find_in_map' collect2: ld returned 1 exit status --// main.c ------------- #include "stack.h" #include "stdio.h" int main(){ find_in_map(); return 0; } --// stack.h -------------- void find_in_map(); --// stack.cpp ----------- #include <stdio.h> #include "stack.h" void find_in_map(){ Â printf("hello"); }